EVERYTHING released June 20 fared better than American Idols Kelly Clarkson and Justin Guarini, whose beach musical FROM JUSTIN TO KELLY opened way down in 11th place with an embarrassing $2.9 million. Its per-theater average of $1,436 is even lower than those of Mariah Carey's GLITTER ($2,008) and Lance Bass and Joey Fatone's ON THE LINE ($2,563). Clarkson, thankfully, has a good singing career going, but for Guarini, this marks two crushing blows in a week, after his CD debuted on the Billboard Album chart at a low No. 20. Is it too late for him to land a permanent judging spot on "American Juniors"?